Read this carefully, absolutely EVERY SINGLE detail has some importance !

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A man and his son go out fishing.

On the way back they have an accident.

Two ambulances come and take the father and his son 
to different (ie: separate) hospitals.

As the son is taken into the operating room, 
the  SURGEON  takes just one look at him and immediately says   
"This man is my son, I cannot operate on him".


HOW CAN THAT BE POSSIBLE ?
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The surgeon is the kid's mother !      Assumptions, assumptions ...........